Aisan Model-SS diaphragm repair kit for their regulators / vaporizers. These are very popular in the newer Toyotas & Caterpillar/Mitsubishi.

There are several versions of this regulator.

We highly recommend also purchasing the AISAN VALVE REPAIR KIT to go along with this item.  The valve material tends to get brittle over time.  There is also an SLOW SOLENOID mounted on the regulator that tends to fail over time that should be considered.